鋁合金超塑性差溫拉深研究.pdf

1、南京航空航天大學碩士學位論文鋁合金超塑性差溫拉深研究姓名：時張杰申請學位級別：碩士專業(yè)：材料加工工程指導教師：童國權(quán)20070601南京航空航天大學碩士學位論文IIIABSTRACTHavingmediummechanicalbehavihighstrengthgoodcrosionresistanceverygoodweldingpropertyAA5083ofsuperplasticaluminiumalloyiswidelyuse

2、dinthedepartmentofAeronauticsAstronauticsship.InthispaperthesuperplasticdifferentialtemperaturedrawingofAA5083aluminumalloyisperfmed.Deepdrawingofsheetismadebythesuperplastictemperaturethecertainstrainrateoftheflangezone

3、ofablankwaskeptthewallofdiewascooled.Thedeepdrawabilityofthesheetwasimprovedmarkedly.UniaxialtensiletestofAA5083aluminumalloywerecarriedouttoresearchmechanicalbehaviattemperaturesbetween350℃535overtheinitialstrainratefro

4、m℃105s1to102s1.Itwasfoundthatthebesttemperatureis525℃thebeststrainrateis1.97104s1themaximumelongationis470%.Bothconstantstrainratevelocityjumptestwerecarriedouttomeasurethestrainratesensitivitym.Thebiggestmvalueis0.50.52

5、weobtainedanelasticviscoplasticconstitutivemodelingunderdifferenttemperature.Thedifferentialtemperaturesuperplasticdrawingrealizedtoimpovedeepdrawabilityofthesheetbycontrollingtemperatureatpunchbottomdieflange.Withresear

6、chondefmationacteristicsofAA5083superplasticaluminumalloywedefinedthematerialpropertyunderdifferenttemperaturebyestablishingtemperaturedistributionwhenpunchtouchedsheetthenthesuperplasticdifferentialtemperaturedrawingofA

7、A5083aluminumalloywassimulatedbyusingMSC.MarcFEMsoftware.FEMsimulationresultwasindicated:thicknessdistributionofthesuperplasticdifferentialtemperaturedrawingwasmeunifmthansuperplasticdrawingdefmingtemperaturethevelocityo

8、fdrawingfrictionwereeffectonFEMsimulationresult.Includingdifferentialtemperatureatpunchbottomdieflangethevelocityofpunchdefmingtemperaturewereevryimptantfactsintheexperimentofsuperplasticdifferentialtemperaturedrawing.Un

9、derbesttemperaturewecalculatedthebestvelocityofdrawing.Intheendthepartofairbuswasfabricatedwiththemethodofsuperplasticdifferentialtemperaturedrawing.FEMsimulationresultiscoincidentwithexperimentalobservationsthicknessdis